Concatenate several fields into one with SQL

Question

I have three tables tag, page, pagetag

With the data below

page

ID      NAME
1           


        

Answer 1

As far as I'm aware SQL92 doesn't define how string concatenation should be done. This means that most engines have their own method.

If you want a database independent method, you'll have to do it outside of the database.

(untested in all but Oracle)

Oracle

SELECT field1 | ', ' | field2
FROM table;

MS SQL

SELECT field1 + ', ' + field2
FROM table;

MySQL

SELECT concat(field1,', ',field2)
FROM table;

PostgeSQL

SELECT field1 || ', ' || field2
FROM table;